P1409 Isuzu EVR Control Circuit Malfunction

P1409 Isuzu EVR Control Circuit Malfunction

Possible causes
  • EGRVR circuit open.
  • VPWR open to EGRVR solenoid.
  • EGRVR circuit short to VPWR or GND.
  • Damaged EGRVR solenoid.
  • Damaged PCM.
    • Tech description
    The EGR vacuum regulator solenoid resistance is between 26 and 40 ohms.
    Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1409 Isuzu Description

    This test checks the electrical function of the EGRVR solenoid. The test fails when the EGRVR circuit voltage is either too high or too low when compared to the expected voltage range. The EGR system must be enabled for the test to be completed.

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